幫助使用GPS座標，Android

Question

我使用此代碼來獲取我的位置並在屏幕上打印座標。

package com.example.alpha; 

import android.app.Activity; 
import android.content.Context; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.widget.Toast; 

public class alpha extends Activity 
{ 
    private LocationManager lm; 
    private LocationListener locationListener; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     //---use the LocationManager class to obtain GPS locations--- 
     lm = (LocationManager) 
      getSystemService(Context.LOCATION_SERVICE);  

     locationListener = new MyLocationListener(); 

     lm.requestLocationUpdates(
      LocationManager.GPS_PROVIDER, 
      0, 
      0, 
      locationListener); 
    } 

    public class MyLocationListener implements LocationListener 
    { 
     public void onLocationChanged(Location loc) { 


      double lat = loc.getLatitude(); 
      double lon = loc.getLongitude(); 
      Toast.makeText(getBaseContext(), "Location changed : alphaLat: " + lat + 
        " alphaLng: " + lon, 
        Toast.LENGTH_SHORT).show(); 

     } 

     @Override 
     public void onProviderDisabled(String provider) { 
      // TODO Auto-generated method stub 
     } 

     @Override 
     public void onProviderEnabled(String provider) { 
      // TODO Auto-generated method stub 
     } 

     @Override 
     public void onStatusChanged(String provider, int status, 
      Bundle extras) { 
      // TODO Auto-generated method stub 
     } 

    }   

} 

的問題是，我想使用的緯度和經度值，以便通過流送他們。有關如何獲取onLocationChanged方法外部座標的任何建議？

Answer 1

而不是聲明lat和lon作爲局部變量，將它們聲明爲類級變量。這樣你可以在onLocationChanged方法外訪問這些值。

public class alpha extends Activity 
{ 
     private LocationManager lm; 
     private LocationListener locationListener; 
     double lat; 
     double lon; 

    public class MyLocationListener implements LocationListener 
    { 
    ... 

    lat = loc.getLatitude(); 
    lon = loc.getLongitude(); 

    ........